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| <a name="SIZEOF-_002d_002d_002d-Size-in-bytes-of-an-expression"></a> |
| <h3 class="section">9.242 <code>SIZEOF</code> — Size in bytes of an expression</h3> |
| <a name="index-SIZEOF"></a> |
| <a name="index-expression-size-1"></a> |
| <a name="index-size-of-an-expression-1"></a> |
| |
| <dl compact="compact"> |
| <dt><em>Description</em>:</dt> |
| <dd><p><code>SIZEOF(X)</code> calculates the number of bytes of storage the |
| expression <code>X</code> occupies. |
| </p> |
| </dd> |
| <dt><em>Standard</em>:</dt> |
| <dd><p>GNU extension |
| </p> |
| </dd> |
| <dt><em>Class</em>:</dt> |
| <dd><p>Inquiry function |
| </p> |
| </dd> |
| <dt><em>Syntax</em>:</dt> |
| <dd><p><code>N = SIZEOF(X)</code> |
| </p> |
| </dd> |
| <dt><em>Arguments</em>:</dt> |
| <dd><table> |
| <tr><td width="15%"><var>X</var></td><td width="70%">The argument shall be of any type, rank or shape.</td></tr> |
| </table> |
| |
| </dd> |
| <dt><em>Return value</em>:</dt> |
| <dd><p>The return value is of type integer and of the system-dependent kind |
| <var>C_SIZE_T</var> (from the <var>ISO_C_BINDING</var> module). Its value is the |
| number of bytes occupied by the argument. If the argument has the |
| <code>POINTER</code> attribute, the number of bytes of the storage area pointed |
| to is returned. If the argument is of a derived type with <code>POINTER</code> |
| or <code>ALLOCATABLE</code> components, the return value does not account for |
| the sizes of the data pointed to by these components. If the argument is |
| polymorphic, the size according to the dynamic type is returned. The argument |
| may not be a procedure or procedure pointer. Note that the code assumes for |
| arrays that those are contiguous; for contiguous arrays, it returns the |
| storage or an array element multiplied by the size of the array. |
| </p> |
| </dd> |
| <dt><em>Example</em>:</dt> |
| <dd><div class="smallexample"> |
| <pre class="smallexample"> integer :: i |
| real :: r, s(5) |
| print *, (sizeof(s)/sizeof(r) == 5) |
| end |
| </pre></div> |
| <p>The example will print <code>.TRUE.</code> unless you are using a platform |
| where default <code>REAL</code> variables are unusually padded. |
| </p> |
| </dd> |
| <dt><em>See also</em>:</dt> |
| <dd><p><a href="C_005fSIZEOF.html#C_005fSIZEOF">C_SIZEOF</a>, <a href="STORAGE_005fSIZE.html#STORAGE_005fSIZE">STORAGE_SIZE</a> |
| </p></dd> |
| </dl> |
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